Without drilling, taps do not engage into the socket (Fig.3, T: 8x17 mm).  This PA does not show the lower border of the inferior alveolar canal (IAC) completely.   The upper border of IAC (yellow dashed line) is referred by the distance (red line) from the distal apex of #30 of Fig.2 (preop PA).  It appears that there is about 5 mm from the bottom of the tap to the upper border of IAC (blue line).

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Xin Wei, DDS, PhD, MS 1st edition 09/30/2014, last revision 09/30/2014